Allen-Bradley 1407-CGCM, Руководство пользователя, Страница: 97 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
CGCM Unit Configuration #HAPTER
Bus A Offsets
•
Voltage multiplier - Establishes a factor by which the Bus A voltage is
scaled during synchronization. It can be used to compensate for
transformer ratio differences between the generator and bus voltages. For
example, if the generator nominal voltage is 4160V and the nominal Bus A
voltage is 12,480V (each measured line-to-line), a voltage multiplier value
of 0.333 permits voltage matching during synchronization. Configuration
table tag
BusA_V_Scaler stores this parameter.
•
Phase - Establishes an offset angle added to the measured Bus A phase
angle. It can be used to compensate for phase shift across transformers or
between delta and wye connected systems.
As an example, consider the system shown in Voltage and Current
Connection for Four-wire Wye Bus and Two (or three) Transformer Delta
Generator System
on page 24 .
When a generator with three-wire (delta) metering is synchronized to a bus
with four-wire (wye) metering, set the phase offset to 30° to compensate
for the 30° lag between the delta and wye systems. Configuration table tag
BusA_PhOffset stores this parameter, expressed in degrees.
Bus B Offsets
•
Voltage multiplier - Establishes a factor by which the Bus B voltage is
scaled during synchronization. It can be used to compensate for
transformer ratio differences between the generator and bus voltages.
Configuration table tag
BusB_V_Scaler stores this parameter.
•
Phase - Establishes an offset angle added to the measured Bus B phase
angle. It can be used to compensate for phase shift across transformers or
between delta and wye connected systems. Configuration table tag
BusB_PhOffset stores this parameter, expressed in degrees.
4)0
The Bus A examples also apply to Bus B.
)-0/24!.4
Table 4 provides a guide for adjusting phase offset for wiring
configurations shown in Chapter 2 , Installation . Other wiring
configurations are possible. It is your responsibility to determine and
verify phase offset values for wiring configurations that are not depicted
in this manual.